The formula for allocation of mandates in each regional constituency is stated in Articles 162 and 163 of the Code. Article 162 establishes a three percent (3%) legal threshold for political parties and a five percent (5%) legal threshold for coalitions. A political party or coalition whose percentage of valid votes in the region is less than the legal threshold does not participate in mandate allocation in the region. The threshold applies in each regional election.
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The VOTA database was created within the framework of the joint programme between the Venice Commission and the European Commission "Democracy through free and fair elections". It is managed jointly by the Secretariat of the Venice Commission and by the Mexican Electoral Tribunal of the Federal Judiciary (TEPJF).